How to slow down TCP/IP in 2.1.108-now

Dietmar Kling (dietmar.kling@usa.net)
Wed, 26 Aug 1998 14:42:17 +0200


Hello,

since 2.1.108- ( < 2.1.108 i can't remember) i found a way to make my
linux box networking very slow.

Note: This does not happen all the time but in 75 % of all cases on my
machine (redhat 5.1)
in 2.0.36pre6 i could _not_ trigger this.

(1) sometimes i use a X-Windows Server (demo version) from star-net on
Windows-NT
(2) I use netscape 4.5 on Linux, which searches at startup for a news
server
-> I do not have a news server and no internet connection so this
takes
a minute to come up (hey, i am too lazy to change this)
(3) While netscape tries to find the news server
I drag around wild one window e.g.kvt (KDE) or a x-terminal

--> the result is : I can not use X-Windows anymore for some time
(10-30 minutes).

The windows blank and everything gets _very_ slow.

The whole TCP/IP now sucks, telnet (not in X-Windows which is
unusable at this time) is like
doing a 300 baud serial connection, samba sleeps and nothing goes
with tcp/ip very fast anymore

The console (compiling works, no messages in the kernel) on the linux
machine is still fast
---> so this is a networking problem.

Now a mystery: if i do a

ifconfig eth0 down
ifconfig eth0 up (on console)

some connections break other get back to normal operation.
telnetting and Samba work again. (but within 10 minutes the
slowdown comes back)

So what's happening here?

Back to 2.0.36pre6 for now (until isdn in 2.1.118 is fixed ).

Regards
Dietmar

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